We numerically estimate the divergence of several two-vertex diagrams that
    contribute to the radiative corrections for the Lorentzian EPRL spin foam
    propagator. We compute the amplitudes as functions of a homogeneous cutoff over
    the bulk quantum numbers, fixed boundary data, and different Immirzi
    parameters, and find that for a class of two-vertex diagrams, those with fewer
    than six internal faces are convergent. The calculations are done with the
    numerical framework sl2cfoam-next.

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